The Office of Thrift Supervision said that it had acted in an appropriate fashion.
The parent company received approval to make the switch last week from the Office of Thrift Supervision.
Institutions that convert would no longer pay annual fees to the Office of Thrift Supervision.
It was the 25th outflow in 26 months, according to the Office of Thrift Supervision.
Last week, the Office of Thrift Supervision said it would hold open hearings.
A spokesman for the Office of Thrift Supervision declined to comment on any investigation.
The Office of Thrift Supervision said today that it expected to announce a decision on the matter within 10 days.
The Office of Thrift Supervision keeps the letters for its own use and opens them to the public by appointment.
Officials at the Office of Thrift Supervision declined to comment.
They said Congress never intended for the Office of Thrift Supervision to play such a large role.